Many writing researchers have followed university students as they enter school and move forward into disciplinary studies in their declared majors. Fewer scholars, however, have explored interdisciplinary programs with complementary or sometimes conflicting academic demands. This dissertation project followed a group of students in an Environmental Studies program who are required to write in a wide range of disciplines, often simultaneously. The research question posed: How do Environmental Studies students reflect on the interdisciplinary goals in their yearlong senior thesis-writing projects? The large, public research university where this research was sited has one of the oldest Environmental Studies programs in the nation. Unlike many other Environmental Studies departments that focus mainly on the sciences, this program includes sciences, social sciences and humanities. The main methodologies of this research project were interviews and textual analysis. Environmental Studies seniors were interviewed two times each—once at the beginning of their senior year when they were enthusiastically beginning their independent research projects and again in the spring, when they were trying to compete the most challenging writing projects of their university tenures. The texts they submitted for analysis include the senior thesis papers and a small sampling of other papers. After these interviews, three student case studies were developed, and their reflections were organized according to categories suggested by researcher Anne Beaufort: subject matter, genre, rhetorical considerations, and writing process. One main findings of the study is that interdisciplinary programs enhance the underlying ethos of Environmental Studies and offer multiple pathways to environmental activism. Even though the most common genre of thesis papers was public policy papers, rather than texts aligned mainly with the sciences or the humanities per se, students stated that interdisciplinary training was an important motivator for them to enter the field of study and to continue their enculturation as Environmental Studies majors.